It started right after the service, so a good chance they messed something with some wiring... When the car is started it's sometimes OK, but after a few minutes of driving it returns.
After driving like that for a while, the yellow "check engine" light also lit up, OBD reads P0500.

Do I get it correctly - the car has 2 ABS sensors AND a separate speed sensor? Does the P0500 code indicate it's the speed sensor and not the ABS sensors?
The shop takes responsibility for now, but they haven't been able to fix it until now and I want to make sure they're in the right direction..